21011002212071 has 2 divisors, whose sum is σ = 21011002212072. Its totient is φ = 21011002212070.

The previous prime is 21011002212007. The next prime is 21011002212077. The reversal of 21011002212071 is 17021220011012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21011002212071 - 2⁶ = 21011002212007 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011002212077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505501106035 + 10505501106036.

It is an arithmetic number, because the mean of its divisors is an integer number (10505501106036).

Almost surely, 2^{21011002212071} is an apocalyptic number.

21011002212071 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011002212071 is an equidigital number, since it uses as much as digits as its factorization.

21011002212071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 21011002212071 its reverse (17021220011012), we get a palindrome (38032222223083).

The spelling of 21011002212071 in words is "twenty-one trillion, eleven billion, two million, two hundred twelve thousand, seventy-one".